JPH0732778A - Safe protective sheet and its truth or falsehood deciding apparatus - Google Patents

Abstract

PURPOSE:To obtain a safe protective sheet in which a forgery is difficult and a forgery product can be easily detected by embedding a safe strand made of a ferromagnetic material in which safety proving data is fixedly or semifixedly stored in a sheet. CONSTITUTION:A safe protective sheet for a product need to prevent forgery of securities, etc., is so provided as to completely embed safe strand 2 made of ferromagnetic material such as amorphous alloy material, etc., in securities 1 or to partly or entirely expose it on a surface. Data is fixedly or semifixedly stored in the strand 2 by a method of heat, cutout, cutting, pressurizing, etc. When the data recorded in the strand 2 is read, a magnetic head 4 is provided, a signal from the head 4 is amplified and binarized by a signal detector 7, then fed to a main controller 9, in which it is discriminated, displayed. The head 4 is moved together with a magnetic coil 5 in an arranging direction of the strand 2 by a drive motor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security paper for products such as securities that require anti-counterfeiting, and an authenticity judging device for the same.

[0002]

2. Description of the Related Art Conventionally, it is well known that a so-called "safety line" made of plastic, aluminum foil or the like is inserted into securities as a countermeasure against forgery. In order to judge the authenticity of securities equipped with a safety line, there is a method of irradiating an infrared light source and detecting the reflection amount or transmission amount thereof, or a method of detecting reflection, absorption amount or induced voltage by electromagnetic waves. Are known.

[0003]

However, in any case, there is a drawback in that it is extremely difficult to make a genuine / counterfeit judgment when it is forged using a material equivalent to the safety wire used.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate these drawbacks and provide a safety protection paper which is not easily counterfeited and has a high degree of safety assurance, and an authenticity judging apparatus for the same.

[0005]

In order to solve this problem, in the safety protection paper according to the present invention, a safety line or the like made of a ferromagnetic material in which data for security assurance is fixed or semi-fixed is stored in the paper. It has a structure characterized by being embedded. Further, the authenticity determination device for the safety protection paper according to the present invention is a data detection means for reading out the stored safety assurance data from the safety line as a magnetic change, with the safety protection paper as described above being handled. Magnetization characteristic detection means for detecting the magnetization characteristic of the safety wire, the safety assurance data read by the data detection means is properly matched with the predetermined authentic safety assurance data, and,
When the magnetizing property detected by the magnetizing property detecting means properly matches the magnetizing property of the safety wire, it is determined that the safety protection paper is authentic, and the read-out safety assurance data is predetermined. And a determination unit that determines that the safety protection paper is counterfeit when it does not properly match the genuine safety assurance data or when the detected magnetization characteristic does not properly match the magnetization characteristic of the safety wire. It has a configuration characterized by that.

[0006]

[Function] When the ferromagnetic material to be embedded in the paper such as securities as a safety wire is a ferromagnetic amorphous material, for example, the portion processed into the material by heat, cutting, cutting, and heating has a magnetic permeability, It is known that the saturation magnetization characteristics and magnetostriction characteristics change. When the safety wire is thermally processed in this way, the magnetic permeability of the processed part is 1 before the processing.
It changes from / 10 to 1/100. Therefore, when the safety wire is excited from the outside, the magnetic flux distribution changes in the part where the permeability changes, and its position can be detected by a magnetic sensor such as a magnetic head, which is used as meaningful information. be able to. Cuts, cuts in the safety line,
With the pressurization, the magnetic resistance also changes, and the information can be fixedly or semi-fixedly stored in the same manner as described above. Such a paper sheet in which a safety line in which fixed or semi-fixed information is stored is embedded cannot be forged by ordinary means due to difficulty in obtaining materials, complexity of storage means, etc. A security paper having security can be realized. Next, the stored fixed or semi-fixed information can be used as one condition for judging the authenticity of the security paper. Moreover, since the magnetic characteristics of the safety wire can be changed by the ratio of the alloy of the amorphous material, it is possible to detect the material of the safety wire by detecting the magnetic characteristics peculiar to the safety wire. You can
Generally such substances are not available by conventional means and are therefore very effective in counterfeiting. As an example of easily detecting the magnetic characteristic of the safety wire, the saturated magnetic characteristic can be used. The B-H characteristic of the magnetic material has a value peculiar to the material, and, for example, the above-mentioned ferromagnetic armophus material is saturated with a magnetic field having a strength peculiar to the material. When external excitation is AC excitation and a static bias magnetic field is added above and below the saturation magnetic field, the generation of a pulse signal due to the large Barkhausen effect generated at the saturation transition detected during AC excitation is not seen. By predetermining this bias value, the material can be identified, and more reliable authenticity determination can be performed. According to the conventional method, the presence / absence of the safety line or the printing pattern, the size, etc. have been used to determine the authenticity, but according to the present invention, in addition to the presence / absence of the safety line made of a special material, The information and the identification of the material written on the safety line itself can be used for anti-counterfeiting purposes, and in addition to anti-counterfeiting purposes, it can also be used for investigating distribution channels for securities, manufacturing date management, manufacturer management, etc. It has the advantage of being possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, in which 1 is a security-lined security. Reference numeral 2 is a ferromagnetic material such as an amorphous alloy material provided as a safety wire. The amorphous alloy material 2 may be formed so as to be completely embedded in the security as shown in the sectional view (b) or partially or wholly exposed on the surface as shown in the sectional view (c). The data is fixedly or semi-fixedly stored by the heat, cutting, cutting, and pressing as described above.

FIG. 2 is a principle diagram of a detection unit for reading the data stored in the amorphous alloy material 2. 3 is a portion of the amorphous alloy material 2 on which information has been recorded, 4 is a magnetic head used as a magnetic sensor for reading a change in magnetic field, 5 is an exciting coil for reading information in the amorphous alloy material 2, and 6 is an exciting coil. 5 is an excitation power source for supplying an excitation current to 5. The amorphous alloy material 2 excited by the exciting coil 5 causes a magnetic field change in the portion 3 where information is recorded by processing such as heat. The magnetic field change is read by the magnetic head 4, and when its output signal is observed at the point A, when the magnetic head 4 moves on the amorphous alloy material 2 or the amorphous alloy material 2 moves on the magnetic head 4, information A voltage change occurs in the recording portion 3. The excitation magnetic field can detect a signal in either DC or AC.

FIG. 3 shows BH characteristics of an amorphous alloy material and a general ferromagnetic material such as pure iron. An amorphous alloy material having such characteristics produces a pulse signal due to the large Barkhausen effect with a magnetic field strength of coercive force Hc, and the magnetic flux density becomes saturated. FIG. 4 is a waveform example showing the relationship between the excitation magnetic field strength and the detected voltage signal. Since the Hc value has a unique value depending on the material, if the Hc is known, it can be used for authenticity determination of the material.

FIG. 5 shows an example of a circuit for reading the data recorded on the amorphous alloy material 2 and detecting the data from the amorphous alloy material. The signal from the magnetic head 4 passes through a signal detection circuit 7 that amplifies and binarizes, and is sent to the main control unit 9. The magnetic head 4 and the magnetic coil 5 are the drive motor 8
The amorphous alloy material 2 is moved in the vertical direction, which is the arrangement direction thereof, by. As a result, the data is sequentially read from the amorphous alloy material 2 and sent to the main control unit 9 to be subjected to processing such as judgment and display. The main controller 9 is realized by a microcomputer. Further, the main controller 9 controls the excitation power supply 6 for exciting and biasing the amorphous alloy material 2 and the position control of the drive motor 8.

FIG. 6A shows a concrete example of the signal detection circuit. IC1 is an operational amplifier for amplification, and I from the magnetic head 4
Amplify the N signal. IC2 is a comparator that binarizes the signal amplified by IC1 to obtain a point B signal. IC3
Uses a monostable multivibrator to shape the waveform into pulse signals at fixed time intervals. For example, as shown in FIG. 6B, the data format is a safety line if the pulse signal is "1" within T1 time after the first pulse signal and "0" when there is no pulse signal. 2 at intervals of engraved machining lines
Valued data can be represented. In addition to this, it is possible to record and read data by a line width data recording system such as that used in bar codes, or the NZ and NRZ systems used in magnetic tapes and the like.

Next, the authenticity determination operation of securities and the like made from the security paper 1 will be described with reference to the flow chart of FIG. First, securities or the like requiring authenticity determination are inserted into the detection device (FIG. 5) (S ₁ ). When the insertion is completed, the magnetic head 4 and the magnetic coil 5 are moved by the drive motor so that the safety wire 2 contained in the safety protection paper 1 is relatively moved (S ₂ ). Safety line 2 with magnetic head
Stored data is read in (S _3). Some data, for example, include an error check bit information, such as parity bits, determines whether the normal data has been read _{(S 4) (S 5)} . When the data is normally read, the data can include, for example, the types of securities and the face value, and the upper and lower limits of their unique values and whether or not they are limited types are determined (S ₆ ) (S ₇ ). If this judgment result is normal, then the magnetic properties of the amorphous alloy material forming the safety line 2 are tested (S ₈ ).
(S ₉ ). If this characteristic is met, this safety paper 1
Securities, etc. made in ( ₁ ) were found to be genuine (S ₁₀ ),
Perform normal processing. If the judgments of (S ₅ ) (S ₇ ) (S ₉ ) are not satisfied, it is judged that the securities are counterfeit products (error processing I, II, III). Even if the condition of (S ₉ ) is excluded from the condition of authenticity determination, it is possible to actually determine most of the counterfeit products.

[0013]

As described above in detail, when a safety wire made of an amorphous alloy material that can write data fixedly or semi-fixedly is put on paper such as securities, it is especially forged like a gift certificate, a check or a stamp. For securities and the like that are greatly damaged by and require social security, counterfeiting is difficult and counterfeit products can be easily detected, so that the effect is great. Further, it is difficult to erase and rewrite the written data, and since the material components are airtight, higher safety can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view (a) and a cross-sectional view (b) (c) of a safety protection paper according to the present invention having a safety line.

FIG. 2 is a layout diagram (a) and an output waveform diagram (b) for explaining a signal detection operation used in the present invention.

FIG. 3 is a BH characteristic diagram of a magnetic material used in the present invention.

FIG. 4 is a waveform diagram showing the excitation intensity and the timing of the detection signal used in the present invention.

FIG. 5 is a schematic diagram showing an example of a data detection device used in the present invention.

FIG. 6 is a circuit diagram (a) and a waveform diagram (b) for explaining an example of a detection circuit used in the present invention.

FIG. 7 is a flowchart for explaining the operation of the device of the present invention.

[Explanation of symbols] 1 Safety protection paper 2 Safety wire (safety wire made of amorphous alloy material) 3 Information recording part 4 Magnetic head 5 Excitation coil 6 Excitation power supply 7 Signal detection circuit 8 Drive motor 9 Main control section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Mizukami 1-741 Kugayama, Suginami-ku, Tokyo Iwasaki Tsushinki Co., Ltd.

Claims (2)

[Claims] 1. A safety protection paper, characterized in that a safety wire made of a ferromagnetic material in which security guarantee data is fixedly or semi-fixedly stored is embedded in the paper. 2. A safety protection paper having a safety wire made of a ferromagnetic material, in which safety guarantee data is fixedly or semi-fixedly stored, is embedded in the paper, and is stored from the safety wire. Data detecting means for reading the safety assurance data as a magnetic change, a magnetization characteristic detecting means for detecting the magnetization characteristic of the safety wire, and the safety assurance data read by the data detecting means has a predetermined authenticity. Properly coincides with the data for safety assurance of, and, when the magnetization characteristic detected by the magnetization characteristic detecting means properly coincides with the magnetization characteristic of the safety wire, it is determined that the safety protection paper is authentic, The read safety assurance data does not properly match the predetermined authentic safety assurance data, or the detected magnetization characteristic properly matches the magnetization characteristic of the safety wire. An authenticity determination device for safety protection paper, comprising a determination means for determining that the security protection paper is counterfeit.